pdnsd-1.2.9a-bp153.1.15

- Add %insserv_prereq PreReq: since we still install legacy initd
  services it is our own duty to ensure the legacy tools to handle
  them are installed.

- make init script executable, fix build

- Changes file was fixed up in according to sr's #175639 & #175789.
- Switched from user nobody to pdns to correspond Factory rules.

- Branched from home:Reki.
- Updated from 1.2.9 to 1.2.9a.
- Spec-file was completely fixed up.